I have made couple different dog-characters in different positions but all with the same filing - happiness and pleasure! 'cause this logo should represent happy and satisfied pet... I have played with "biting a collar rope" (dog is exited and wants his master to bring him to the store) and with "biting bone" 'cause that's what dogs like the most and in this design dogs nose and the bone are look like a knot, so the logo is explaining it's name "bite knot"...